Fixed TEST_CALL_FILTER bugs in dCGH Snakefile

 - Created separate variable for TEST_CONTIGS, which means rule dCGH runs on ALL_CONTIGS by default instead of just the contigs being tested
 - Added rule test_call_filter which allows snakemake to recognize wildcards in rule genotype_refine_breakpoints_by_chr_subset
 - Removed input requirements in rule clean_call_filter_test